Add shortcut to Mapbox Metrics opt-out to ℹ️

[1ec5]

Per #1518, we already have the technology to detect that a user switch for Mapbox Metrics has been added to the host app’s Settings bundle. When we see that, we should add an “Adjust Privacy Settings” button to the ℹ️ menu that takes the user to the host app’s settings in the Settings app. According to #1075, this should do the trick:

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];

[friedbunny]

Busting users out to the proper Settings.app sub-section is iOS 8+, FYI.